Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea
Recent studies suggest that the variability in Antarctic Bottom Water (AABW) properties in the Scotia Sea on time scales up to decadal may be linked to changes in the baroclinicity of the Weddell gyre, with vertical variations in the density structure at the gyre's northern edge acting to contr...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2010
|
Subjects: | |
Online Access: | https://pure.uhi.ac.uk/en/publications/ab86dd50-b647-412d-a781-8282d1ba7da7 https://doi.org/10.1029/2010GL042822 |
id |
ftuhipublicatio:oai:pure.atira.dk:publications/ab86dd50-b647-412d-a781-8282d1ba7da7 |
---|---|
record_format |
openpolar |
spelling |
ftuhipublicatio:oai:pure.atira.dk:publications/ab86dd50-b647-412d-a781-8282d1ba7da7 2024-09-15T17:46:20+00:00 Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea Jullion, Loic Jones, Samuel Naveira Garabato, Alberto C. Meredith, Michael P. 2010-05-14 https://pure.uhi.ac.uk/en/publications/ab86dd50-b647-412d-a781-8282d1ba7da7 https://doi.org/10.1029/2010GL042822 eng eng https://pure.uhi.ac.uk/en/publications/ab86dd50-b647-412d-a781-8282d1ba7da7 info:eu-repo/semantics/openAccess Jullion , L , Jones , S , Naveira Garabato , A C & Meredith , M P 2010 , ' Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea ' , Geophysical Research Letters , vol. 37 , no. L09609 . https://doi.org/10.1029/2010GL042822 Antarctic Bottom Water Southern Annular Mode Drake Passage article 2010 ftuhipublicatio https://doi.org/10.1029/2010GL042822 2024-08-12T23:37:04Z Recent studies suggest that the variability in Antarctic Bottom Water (AABW) properties in the Scotia Sea on time scales up to decadal may be linked to changes in the baroclinicity of the Weddell gyre, with vertical variations in the density structure at the gyre's northern edge acting to control the export of AABW over the South Scotia Ridge and toward the mid-latitude South Atlantic. We test this hypothesis by analysing the AABW properties in fifteen occupations of the SR1b hydrographic section (1993–2009) in eastern Drake Passage alongside possible forcings as derived from atmospheric reanalysis data. We show that variability in the wind stress over the Weddell gyre leads changes in AABW properties in the SR1b section by approximately five months. The sign of the lagged correlation is consistent with the notion of the AABW export from the Weddell Sea being controlled by the gyre's baroclinic adjustment to wind forcing on time scales of several months. Variability in the regional winds is found to be closely linked to the Southern Annular Mode (SAM). These results suggest that there may be a causal relationship between the SAM's positive tendency observed in recent decades and the subsequent warming of AABW detected across much of the Atlantic Ocean. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea University of the Highlands and Islands: Research Database of UHI Geophysical Research Letters 37 9 n/a n/a |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
Antarctic Bottom Water Southern Annular Mode Drake Passage |
spellingShingle |
Antarctic Bottom Water Southern Annular Mode Drake Passage Jullion, Loic Jones, Samuel Naveira Garabato, Alberto C. Meredith, Michael P. Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea |
topic_facet |
Antarctic Bottom Water Southern Annular Mode Drake Passage |
description |
Recent studies suggest that the variability in Antarctic Bottom Water (AABW) properties in the Scotia Sea on time scales up to decadal may be linked to changes in the baroclinicity of the Weddell gyre, with vertical variations in the density structure at the gyre's northern edge acting to control the export of AABW over the South Scotia Ridge and toward the mid-latitude South Atlantic. We test this hypothesis by analysing the AABW properties in fifteen occupations of the SR1b hydrographic section (1993–2009) in eastern Drake Passage alongside possible forcings as derived from atmospheric reanalysis data. We show that variability in the wind stress over the Weddell gyre leads changes in AABW properties in the SR1b section by approximately five months. The sign of the lagged correlation is consistent with the notion of the AABW export from the Weddell Sea being controlled by the gyre's baroclinic adjustment to wind forcing on time scales of several months. Variability in the regional winds is found to be closely linked to the Southern Annular Mode (SAM). These results suggest that there may be a causal relationship between the SAM's positive tendency observed in recent decades and the subsequent warming of AABW detected across much of the Atlantic Ocean. |
format |
Article in Journal/Newspaper |
author |
Jullion, Loic Jones, Samuel Naveira Garabato, Alberto C. Meredith, Michael P. |
author_facet |
Jullion, Loic Jones, Samuel Naveira Garabato, Alberto C. Meredith, Michael P. |
author_sort |
Jullion, Loic |
title |
Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea |
title_short |
Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea |
title_full |
Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea |
title_fullStr |
Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea |
title_full_unstemmed |
Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea |
title_sort |
wind-controlled export of antarctic bottom water out of the weddell sea |
publishDate |
2010 |
url |
https://pure.uhi.ac.uk/en/publications/ab86dd50-b647-412d-a781-8282d1ba7da7 https://doi.org/10.1029/2010GL042822 |
genre |
Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea |
op_source |
Jullion , L , Jones , S , Naveira Garabato , A C & Meredith , M P 2010 , ' Wind-controlled export of Antarctic Bottom Water out of the Weddell Sea ' , Geophysical Research Letters , vol. 37 , no. L09609 . https://doi.org/10.1029/2010GL042822 |
op_relation |
https://pure.uhi.ac.uk/en/publications/ab86dd50-b647-412d-a781-8282d1ba7da7 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2010GL042822 |
container_title |
Geophysical Research Letters |
container_volume |
37 |
container_issue |
9 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1810494384524754944 |